it will boost your energy, help you feel more full. and it can raise metabolism by up to 3%. you drink until your pee looks like lemonade. that's how you know you're hydrated. >> alisyn: last, you can't just eat your way being thin. you have to also be active. >> find an activity you love. do more of it. i give you a tip for how to burn the most calories during your work out. >> brian: one thing you said, people, you open up the book, everybody is writing a diet book and it clouded everything up, so makes people throw up their happened. and you have to exercise, right? no matter what is in this book, you still are to factor in exercise. >> if you want to lose weight, if you're not eating right, but working out or working out but not eating right, you're in neutral. you have to work out and eat right. >> brian: whatever you're doing is working. have you ever put on a pound of fat? >> i was an overweight kid. so i spent years learning this whole philosophy of diet and exercise, for lack of a scientific term. i do occasionally. but i've got balance. there is the 80/20 rule. >> s